/**
   A class to compare numbers.
*/
public class Numbers
{
   /**
      Checks whether three numbers are all different
      @return true if none of the numbers a, b, or c are equal to another
   */
   public boolean allDifferent(int a, int b, int c)
   {
        if(a==0 && b==0 && c==0){
         return true;
      }
      else if(a>0 && b>0 && c>0){
         return true;
      }
      else if(a<0 && b<0 && c<0){
         return true;
      }
      else {
         return false;
      }
   }
}